commit 7f899a57a83b60356f43807ba4c7b1878909adec
Author: Samuel Pua <kahkin@gmail.com>
Date:   Thu Nov 25 17:55:49 2021 +0800

    First working version

diff --git a/.gitignore b/.gitignore
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index 0000000..fcb9767
--- /dev/null
+++ b/.gitignore
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+
+# Created by https://www.toptal.com/developers/gitignore/api/python,macos,linux,vim
+# Edit at https://www.toptal.com/developers/gitignore?templates=python,macos,linux,vim
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
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+.nfs*
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+# General
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+.AppleDouble
+.LSOverride
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+Icon
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+
+# Thumbnails
+._*
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+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
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+.AppleDB
+.AppleDesktop
+Network Trash Folder
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+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
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+*.so
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+.Python
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+lib/
+lib64/
+parts/
+sdist/
+var/
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+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
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+#  Usually these files are written by a python script from a template
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+*.manifest
+*.spec
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+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
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+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
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+instance/
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+.scrapy
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+docs/_build/
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+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
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+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
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+__pypackages__/
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+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
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+# SageMath parsed files
+*.sage.py
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+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
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+# Spyder project settings
+.spyderproject
+.spyproject
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+.ropeproject
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+# mkdocs documentation
+/site
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+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
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+.pyre/
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+.pytype/
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+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
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+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
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+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+# End of https://www.toptal.com/developers/gitignore/api/python,macos,linux,vim
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e2722b6
--- /dev/null
+++ b/README.md
@@ -0,0 +1,16 @@
+# GAuth QR Reencoder
+
+This tool is used to conver image files from Google Authenticator's QR code from both migration (export) and new TOTP.
+
+## Usage
+
+The script would take a screenshot of the screen in 2 seconds, then parse the first eligible QR code shown on the screen.
+
+Execute the following to start the Python script:
+```
+python3 gauth_reencoder.py
+```
+
+## References
+
+This project utilises code from digitalduke (https://github.com/digitalduke/otpauth-migration-decoder)
diff --git a/gauth_reencoder.py b/gauth_reencoder.py
new file mode 100644
index 0000000..a9fd488
--- /dev/null
+++ b/gauth_reencoder.py
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+from PIL import Image
+import PIL
+import pyzbar.pyzbar as pyzbar
+import otpauth_migration_decoder.src.decoder
+import urllib.parse
+import time
+import qrcode
+
+def decode_qr_file(img_file: str) -> str:
+    img = Image.open(img_file)
+    decoded = pyzbar.decode(img)
+    return decoded[0].data.decode("utf8")
+
+def decode_screenshot_img() -> str:
+    from PIL import ImageGrab
+    img = ImageGrab.grab()
+    decoded = pyzbar.decode(img)
+    return decoded[0].data.decode("utf8")
+
+def decode_totp(totp_uri: str) -> list:
+    issuer_start = totp_uri.split("&issuer=")[1]
+    issuer = issuer_start.split("&")[0]
+
+    secret_start = totp_uri.split("&secret=")[1]
+    secret = secret_start.split("&")[0]
+
+    algorithm_start = totp_uri.split("?algorithm=")[1]
+    algorithm = algorithm_start.split("&")[0]
+
+    account_start = totp_uri.split("totp/")[1]
+    account = account_start.split("?")[0]
+
+    digits_start = totp_uri.split("&digits=")[1]
+    digits = digits_start.split("&")[0]
+
+    issuer = urllib.parse.unquote_plus(issuer)
+    secret = urllib.parse.unquote_plus(secret)
+    algorithm = urllib.parse.unquote_plus(algorithm)
+    account = urllib.parse.unquote_plus(account)
+    digits = urllib.parse.unquote_plus(digits)
+    
+    return {"issuer": issuer, "account": account, "algorithm": algorithm, "secret": secret, "digits": digits}
+    
+def generate_qr_code(totp_details: dict):
+    issuer = urllib.parse.quote(totp_details["issuer"])
+    account = urllib.parse.quote(totp_details["account"])
+    algorithm = urllib.parse.quote(totp_details["algorithm"])
+    secret = urllib.parse.quote(totp_details["secret"])
+    digits = urllib.parse.quote(totp_details["digits"])
+    
+    generated_uri = "otpauth://totp/%s?algorithm=%s&digits=%s&issuer=%s&secret=%s" % (
+        account,
+        algorithm,
+        digits,
+        issuer,
+        secret
+    )
+    img = qrcode.make(generated_uri)
+    print(generated_uri)
+    img.show()
+
+
+def main():
+    print("Grabbing screenshot in 2 seconds...")
+    time.sleep(2)
+    decoded_data = decode_screenshot_img()
+    print(decoded_data)
+    
+    totp_uri_list: list = []
+    if "otpauth-migration" in decoded_data:
+        totp_uri_list = otpauth_migration_decoder.src.decoder.start_decode_migration(decoded_data)
+    elif "otpauth://totp/" in decoded_data:
+        totp_uri_list.append(decoded_data)
+    else:
+        print("Error in QR code. Please check if it is proper Google Authenticator QR code.")
+        return
+    
+    for uri in totp_uri_list:
+        try:
+            curr_totp_details = decode_totp(uri)
+            print(curr_totp_details)
+        except:
+            print("Error in parsing the following URI: %s" % uri)
+
+        # Checking for each item
+        print()
+        print()
+        print("Do you want to change: (separator is \":::\")")
+        print("%s:::%s   ...   " % (curr_totp_details["issuer"], curr_totp_details["account"]), end="")
+        updated_data = input()
+        updated_data_splitted = updated_data.split(":::")
+        if updated_data != "":
+            curr_totp_details["issuer"] = updated_data_splitted[0]
+            curr_totp_details["account"] = updated_data_splitted[1]
+            generate_qr_code(curr_totp_details)
+
+if __name__ == "__main__":
+    main()
diff --git a/otpauth_migration_decoder/.editorconfig b/otpauth_migration_decoder/.editorconfig
new file mode 100644
index 0000000..e5c71fe
--- /dev/null
+++ b/otpauth_migration_decoder/.editorconfig
@@ -0,0 +1,11 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{json,yml}]
+indent_size = 2
diff --git a/otpauth_migration_decoder/.envrc.example b/otpauth_migration_decoder/.envrc.example
new file mode 100644
index 0000000..d23567b
--- /dev/null
+++ b/otpauth_migration_decoder/.envrc.example
@@ -0,0 +1 @@
+layout python python3.9
diff --git a/otpauth_migration_decoder/.gitignore b/otpauth_migration_decoder/.gitignore
new file mode 100644
index 0000000..03a1c8b
--- /dev/null
+++ b/otpauth_migration_decoder/.gitignore
@@ -0,0 +1,2 @@
+decoder.build/
+decoder.dist/
diff --git a/otpauth_migration_decoder/README.md b/otpauth_migration_decoder/README.md
new file mode 100644
index 0000000..48096f6
--- /dev/null
+++ b/otpauth_migration_decoder/README.md
@@ -0,0 +1,31 @@
+# otpauth migration decoder
+
+Convert Google Authenticator data to plain otpauth links
+
+
+## usage
+
+1. get QR code in "Google Authenticator" app (Menu → Transfer accounts → Export accounts → Select accounts → Next)
+1. extract link from QR code with your preferred [QR codes reading software](https://play.google.com/store/search?q=qr%20code%20reader)
+1. pass migration link (`otpauth-migration://offline?data=...`) to this tool
+
+## requirements
+
+The protobuf package is required to running this script:
+
+```.shell
+$ pip install protobuf
+```
+
+## example
+
+```
+$ python decoder.py "otpauth-migration://offline?data=CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC"
+```
+
+
+## references
+
+1. [otpauth:// URI format](https://github.com/google/google-authenticator/wiki/Key-Uri-Format)
+1. [Protocol Buffer Basics: Python](https://developers.google.com/protocol-buffers/docs/pythontutorial)
+1. [Authenticator live demo](https://rootprojects.org/authenticator/)
diff --git a/otpauth_migration_decoder/poetry.lock b/otpauth_migration_decoder/poetry.lock
new file mode 100644
index 0000000..124ebe3
--- /dev/null
+++ b/otpauth_migration_decoder/poetry.lock
@@ -0,0 +1,526 @@
+[[package]]
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+version = "1.4.4"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "atomicwrites"
+version = "1.4.0"
+description = "Atomic file writes."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "attrs"
+version = "21.2.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[package.extras]
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+docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
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+tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "mypy", "pytest-mypy-plugins"]
+
+[[package]]
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+[[package]]
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+[package.extras]
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+[[package]]
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+[[package]]
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diff --git a/otpauth_migration_decoder/pyproject.toml b/otpauth_migration_decoder/pyproject.toml
new file mode 100644
index 0000000..bd68d4a
--- /dev/null
+++ b/otpauth_migration_decoder/pyproject.toml
@@ -0,0 +1,24 @@
+[tool.poetry]
+name = "otpauth-migration-decoder"
+version = "0.1.1"
+description = "Convert otpauth-migration to plain link"
+authors = ["digitalduke <digitalduke@gmail.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.9"
+protobuf = "^3.17.3"
+click = "^8.0.1"
+
+[tool.poetry.dev-dependencies]
+Nuitka = "^0.6.15"
+isort = "^5.9.1"
+pytest = "*"
+pytest-cov = "*"
+tox = "*"
+tox-poetry = "*"
+mypy = "^0.910"
+types-protobuf = "*"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/otpauth_migration_decoder/setup.cfg b/otpauth_migration_decoder/setup.cfg
new file mode 100644
index 0000000..466b423
--- /dev/null
+++ b/otpauth_migration_decoder/setup.cfg
@@ -0,0 +1,12 @@
+[tool:isort]
+line_length = 120
+indent = '    '
+multi_line_output = 3
+no_lines_before = LOCALFOLDER
+use_parentheses = true
+lines_after_imports = 2
+skip_glob = .tox,.direnv,*_pb2.py
+include_trailing_comma = true
+case_sensitive = true
+force_grid_wrap = 2
+combine_as_imports = true
diff --git a/otpauth_migration_decoder/src/decoder.py b/otpauth_migration_decoder/src/decoder.py
new file mode 100644
index 0000000..063d9bf
--- /dev/null
+++ b/otpauth_migration_decoder/src/decoder.py
@@ -0,0 +1,109 @@
+from base64 import (
+    b32encode,
+    b64decode,
+)
+from collections.abc import Generator
+from typing import (
+    Any,
+    Dict,
+    List,
+    Union,
+)
+from urllib.parse import (
+    ParseResult,
+    parse_qs,
+    quote,
+    urlencode,
+    urlparse,
+)
+
+from .otpauth_enums import (
+    Algorithm,
+    DigitCount,
+    OtpType,
+)
+from .otpauth_migration_pb2 import Payload
+
+
+SCHEME = 'otpauth-migration'
+HOSTNAME = 'offline'
+PAYLOAD_MARK = 'data'
+EXAMPLE_PAYLOAD = 'CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC'
+EXAMPLE_MIGRATION = f'{SCHEME}://{HOSTNAME}?{PAYLOAD_MARK}={EXAMPLE_PAYLOAD}'
+
+
+def is_migration_incorrect(
+        *,
+        parsed_url: ParseResult,
+        parsed_qs: Dict[str, Any],
+) -> bool:
+    return (
+            parsed_url.scheme != SCHEME
+            or parsed_url.hostname != HOSTNAME
+            or PAYLOAD_MARK not in parsed_qs
+            or not isinstance(parsed_qs[PAYLOAD_MARK], list)
+    )
+
+
+def decoded_data(data: List[str]) -> Generator:
+    for data_item in data:
+        yield b64decode(data_item)
+
+
+def decode_secret(secret: bytes) -> str:
+    return str(b32encode(secret), 'utf-8').replace('=', '')
+
+
+def get_url_params(otp: Payload.OtpParameters) -> str:
+    params: dict[str, Union[str, int]] = {}
+
+    if otp.algorithm:
+        params.update(algorithm=Algorithm.get(otp.algorithm, ''))
+    if otp.digits:
+        params.update(digits=DigitCount.get(otp.digits, ''))
+    if otp.issuer:
+        params.update(issuer=otp.issuer)
+    if otp.secret:
+        otp_secret = decode_secret(otp.secret)
+        params.update(secret=otp_secret)
+
+    return urlencode(params)
+
+
+def get_otpauth_url(otp: Payload.OtpParameters) -> str:
+    otp_type = OtpType.get(otp.type, '')
+    otp_name = quote(otp.name)
+    otp_params = get_url_params(otp)
+
+    return f'otpauth://{otp_type}/{otp_name}?{otp_params}'
+
+
+def validate_migration(migration: str) -> list:
+    url: ParseResult = urlparse(migration)
+    qs: Dict[str, Any] = parse_qs(url.query)
+
+
+    return qs[PAYLOAD_MARK]
+
+
+def decoder(migration_data: list) -> list:
+    """Convert Google Authenticator data to plain otpauth links"""
+    result = []
+
+    for payload in decoded_data(data=migration_data):
+        migration_payload = Payload()
+        migration_payload.ParseFromString(payload)
+
+        for otp_item in migration_payload.otp_parameters:
+            result.append(get_otpauth_url(otp_item))
+    
+    return result
+
+def start_decode_migration(migration_code: str) -> list:
+    payload_list = validate_migration(migration_code)
+    results = decoder(payload_list)
+    return results
+    
+if __name__ == "__main__":
+    start_decode_migration("otpauth-migration://offline?data=CkAKFFUlyp7lQLXJnL8Oc5%2BjVRVCEIMPEhpHb29nbGU6cHVha2Foa2luQGdtYWlsLmNvbRoGR29vZ2xlIAEoATACCj0KFEMSL8awHj%2BEFzX2cODi9rNgfvPFEhdHb29nbGU6a2Foa2luQGdtYWlsLmNvbRoGR29vZ2xlIAEoATACCi8KEBdHlsAmppdFyWD18FyPcQkSDXNhbXVlbEBhcG9sbG8aBmFwb2xsbyABKAEwAgouChQpi9Btg%2BHoQJj6tilYEsOef%2BSkiRIQc2FtdWVsQGFwaHJvZGl0ZSABKAEwAgo1ChDnUjGxj%2BJmsJJxdcrbBNpqEhBzYW11ZWxAc2FtdWVscHVhGglzYW11ZWxwdWEgASgBMAIKUAoUihAclMtkwYi3NfvbkHcHmgAi2yESJmdpdGxhYi5jb206Z2l0bGFiLmNvbV9rYWhraW5AZ21haWwuY29tGgpnaXRsYWIuY29tIAEoATACCioKCsaExzWrYHtcsLoSDkdpdEh1Yjp0ZWxib29uGgZHaXRIdWIgASgBMAIKbwooyfRfWMXsY%2B%2B%2FVvZKl9ypsl1VLAZrOPmyr3AsGxeCOuTHmGdGpt4OyBIoQW1hem9uIFdlYiBTZXJ2aWNlczp0ZWxib29uQDI2Nzk5NDAyOTgxMBoTQW1hem9uIFdlYiBTZXJ2aWNlcyABKAEwAgp%2FCiieutAtJJdKrtOMVznsVaMbvrpM%2FNvwURQSChMpPzgI2PlVshsoRk3QEjhBbWF6b24gV2ViIFNlcnZpY2VzOnJvb3QtYWNjb3VudC1tZmEtZGV2aWNlQDI2Nzk5NDAyOTgxMBoTQW1hem9uIFdlYiBTZXJ2aWNlcyABKAEwAgozCgr2b4%2BKdfJzdo%2ByEhRzYW11ZWxAd2F0Y2h0b3dyLmNvbRoJTWljcm9zb2Z0IAEoATACEAEYAiAAKKessZb6%2F%2F%2F%2F%2FwE%3D")
+
diff --git a/otpauth_migration_decoder/src/otpauth-migration.proto b/otpauth_migration_decoder/src/otpauth-migration.proto
new file mode 100644
index 0000000..4105dba
--- /dev/null
+++ b/otpauth_migration_decoder/src/otpauth-migration.proto
@@ -0,0 +1,37 @@
+syntax = "proto3";
+
+package otpauth_migration;
+
+message Payload {
+  enum Algorithm {
+    ALGORITHM_UNSPECIFIED = 0;
+    ALGORITHM_SHA1 = 1;
+    ALGORITHM_SHA256 = 2;
+    ALGORITHM_SHA512 = 3;
+    ALGORITHM_MD5 = 4;
+  }
+  enum DigitCount {
+    DIGIT_COUNT_UNSPECIFIED = 0;
+    DIGIT_COUNT_SIX = 1;
+    DIGIT_COUNT_EIGHT = 2;
+  }
+  enum OtpType {
+    OTP_TYPE_UNSPECIFIED = 0;
+    OTP_TYPE_HOTP = 1;
+    OTP_TYPE_TOTP = 2;
+  }
+  message OtpParameters {
+    bytes secret = 1;
+    string name = 2;
+    string issuer = 3;
+    Algorithm algorithm = 4;
+    DigitCount digits = 5;
+    OtpType type = 6;
+    int64 counter = 7;
+  }
+  repeated OtpParameters otp_parameters = 1;
+  int32 version = 2;
+  int32 batch_size = 3;
+  int32 batch_index = 4;
+  int32 batch_id = 5;
+}
\ No newline at end of file
diff --git a/otpauth_migration_decoder/src/otpauth_enums.py b/otpauth_migration_decoder/src/otpauth_enums.py
new file mode 100644
index 0000000..2c27206
--- /dev/null
+++ b/otpauth_migration_decoder/src/otpauth_enums.py
@@ -0,0 +1,19 @@
+from typing import Mapping
+
+
+Algorithm: Mapping[int, str] = {
+    1: 'SHA1',
+    2: 'SHA256',
+    3: 'SHA512',
+    4: 'MD5',
+}
+
+DigitCount: Mapping[int, str] = {
+    1: '6',
+    2: '8',
+}
+
+OtpType: Mapping[int, str] = {
+    1: 'hotp',
+    2: 'totp',
+}
diff --git a/otpauth_migration_decoder/src/otpauth_migration_pb2.py b/otpauth_migration_decoder/src/otpauth_migration_pb2.py
new file mode 100644
index 0000000..e7e3c31
--- /dev/null
+++ b/otpauth_migration_decoder/src/otpauth_migration_pb2.py
@@ -0,0 +1,290 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: otpauth-migration.proto
+"""Generated protocol buffer code."""
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor.FileDescriptor(
+  name='otpauth-migration.proto',
+  package='otpauth_migration',
+  syntax='proto3',
+  serialized_options=None,
+  create_key=_descriptor._internal_create_key,
+  serialized_pb=b'\n\x17otpauth-migration.proto\x12\x11otpauth_migration\"\xa7\x05\n\x07Payload\x12@\n\x0eotp_parameters\x18\x01 \x03(\x0b\x32(.otpauth_migration.Payload.OtpParameters\x12\x0f\n\x07version\x18\x02 \x01(\x05\x12\x12\n\nbatch_size\x18\x03 \x01(\x05\x12\x13\n\x0b\x62\x61tch_index\x18\x04 \x01(\x05\x12\x10\n\x08\x62\x61tch_id\x18\x05 \x01(\x05\x1a\xf0\x01\n\rOtpParameters\x12\x0e\n\x06secret\x18\x01 \x01(\x0c\x12\x0c\n\x04name\x18\x02 \x01(\t\x12\x0e\n\x06issuer\x18\x03 \x01(\t\x12\x37\n\talgorithm\x18\x04 \x01(\x0e\x32$.otpauth_migration.Payload.Algorithm\x12\x35\n\x06\x64igits\x18\x05 \x01(\x0e\x32%.otpauth_migration.Payload.DigitCount\x12\x30\n\x04type\x18\x06 \x01(\x0e\x32\".otpauth_migration.Payload.OtpType\x12\x0f\n\x07\x63ounter\x18\x07 \x01(\x03\"y\n\tAlgorithm\x12\x19\n\x15\x41LGORITHM_UNSPECIFIED\x10\x00\x12\x12\n\x0e\x41LGORITHM_SHA1\x10\x01\x12\x14\n\x10\x41LGORITHM_SHA256\x10\x02\x12\x14\n\x10\x41LGORITHM_SHA512\x10\x03\x12\x11\n\rALGORITHM_MD5\x10\x04\"U\n\nDigitCount\x12\x1b\n\x17\x44IGIT_COUNT_UNSPECIFIED\x10\x00\x12\x13\n\x0f\x44IGIT_COUNT_SIX\x10\x01\x12\x15\n\x11\x44IGIT_COUNT_EIGHT\x10\x02\"I\n\x07OtpType\x12\x18\n\x14OTP_TYPE_UNSPECIFIED\x10\x00\x12\x11\n\rOTP_TYPE_HOTP\x10\x01\x12\x11\n\rOTP_TYPE_TOTP\x10\x02\x62\x06proto3'
+)
+
+
+
+_PAYLOAD_ALGORITHM = _descriptor.EnumDescriptor(
+  name='Algorithm',
+  full_name='otpauth_migration.Payload.Algorithm',
+  filename=None,
+  file=DESCRIPTOR,
+  create_key=_descriptor._internal_create_key,
+  values=[
+    _descriptor.EnumValueDescriptor(
+      name='ALGORITHM_UNSPECIFIED', index=0, number=0,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='ALGORITHM_SHA1', index=1, number=1,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='ALGORITHM_SHA256', index=2, number=2,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='ALGORITHM_SHA512', index=3, number=3,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='ALGORITHM_MD5', index=4, number=4,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+  ],
+  containing_type=None,
+  serialized_options=None,
+  serialized_start=447,
+  serialized_end=568,
+)
+_sym_db.RegisterEnumDescriptor(_PAYLOAD_ALGORITHM)
+
+_PAYLOAD_DIGITCOUNT = _descriptor.EnumDescriptor(
+  name='DigitCount',
+  full_name='otpauth_migration.Payload.DigitCount',
+  filename=None,
+  file=DESCRIPTOR,
+  create_key=_descriptor._internal_create_key,
+  values=[
+    _descriptor.EnumValueDescriptor(
+      name='DIGIT_COUNT_UNSPECIFIED', index=0, number=0,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='DIGIT_COUNT_SIX', index=1, number=1,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='DIGIT_COUNT_EIGHT', index=2, number=2,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+  ],
+  containing_type=None,
+  serialized_options=None,
+  serialized_start=570,
+  serialized_end=655,
+)
+_sym_db.RegisterEnumDescriptor(_PAYLOAD_DIGITCOUNT)
+
+_PAYLOAD_OTPTYPE = _descriptor.EnumDescriptor(
+  name='OtpType',
+  full_name='otpauth_migration.Payload.OtpType',
+  filename=None,
+  file=DESCRIPTOR,
+  create_key=_descriptor._internal_create_key,
+  values=[
+    _descriptor.EnumValueDescriptor(
+      name='OTP_TYPE_UNSPECIFIED', index=0, number=0,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='OTP_TYPE_HOTP', index=1, number=1,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+    _descriptor.EnumValueDescriptor(
+      name='OTP_TYPE_TOTP', index=2, number=2,
+      serialized_options=None,
+      type=None,
+      create_key=_descriptor._internal_create_key),
+  ],
+  containing_type=None,
+  serialized_options=None,
+  serialized_start=657,
+  serialized_end=730,
+)
+_sym_db.RegisterEnumDescriptor(_PAYLOAD_OTPTYPE)
+
+
+_PAYLOAD_OTPPARAMETERS = _descriptor.Descriptor(
+  name='OtpParameters',
+  full_name='otpauth_migration.Payload.OtpParameters',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  create_key=_descriptor._internal_create_key,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='secret', full_name='otpauth_migration.Payload.OtpParameters.secret', index=0,
+      number=1, type=12, cpp_type=9, label=1,
+      has_default_value=False, default_value=b"",
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='name', full_name='otpauth_migration.Payload.OtpParameters.name', index=1,
+      number=2, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=b"".decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='issuer', full_name='otpauth_migration.Payload.OtpParameters.issuer', index=2,
+      number=3, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=b"".decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='algorithm', full_name='otpauth_migration.Payload.OtpParameters.algorithm', index=3,
+      number=4, type=14, cpp_type=8, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='digits', full_name='otpauth_migration.Payload.OtpParameters.digits', index=4,
+      number=5, type=14, cpp_type=8, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='type', full_name='otpauth_migration.Payload.OtpParameters.type', index=5,
+      number=6, type=14, cpp_type=8, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='counter', full_name='otpauth_migration.Payload.OtpParameters.counter', index=6,
+      number=7, type=3, cpp_type=2, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=205,
+  serialized_end=445,
+)
+
+_PAYLOAD = _descriptor.Descriptor(
+  name='Payload',
+  full_name='otpauth_migration.Payload',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  create_key=_descriptor._internal_create_key,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='otp_parameters', full_name='otpauth_migration.Payload.otp_parameters', index=0,
+      number=1, type=11, cpp_type=10, label=3,
+      has_default_value=False, default_value=[],
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='version', full_name='otpauth_migration.Payload.version', index=1,
+      number=2, type=5, cpp_type=1, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='batch_size', full_name='otpauth_migration.Payload.batch_size', index=2,
+      number=3, type=5, cpp_type=1, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='batch_index', full_name='otpauth_migration.Payload.batch_index', index=3,
+      number=4, type=5, cpp_type=1, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+    _descriptor.FieldDescriptor(
+      name='batch_id', full_name='otpauth_migration.Payload.batch_id', index=4,
+      number=5, type=5, cpp_type=1, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR,  create_key=_descriptor._internal_create_key),
+  ],
+  extensions=[
+  ],
+  nested_types=[_PAYLOAD_OTPPARAMETERS, ],
+  enum_types=[
+    _PAYLOAD_ALGORITHM,
+    _PAYLOAD_DIGITCOUNT,
+    _PAYLOAD_OTPTYPE,
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=51,
+  serialized_end=730,
+)
+
+_PAYLOAD_OTPPARAMETERS.fields_by_name['algorithm'].enum_type = _PAYLOAD_ALGORITHM
+_PAYLOAD_OTPPARAMETERS.fields_by_name['digits'].enum_type = _PAYLOAD_DIGITCOUNT
+_PAYLOAD_OTPPARAMETERS.fields_by_name['type'].enum_type = _PAYLOAD_OTPTYPE
+_PAYLOAD_OTPPARAMETERS.containing_type = _PAYLOAD
+_PAYLOAD.fields_by_name['otp_parameters'].message_type = _PAYLOAD_OTPPARAMETERS
+_PAYLOAD_ALGORITHM.containing_type = _PAYLOAD
+_PAYLOAD_DIGITCOUNT.containing_type = _PAYLOAD
+_PAYLOAD_OTPTYPE.containing_type = _PAYLOAD
+DESCRIPTOR.message_types_by_name['Payload'] = _PAYLOAD
+_sym_db.RegisterFileDescriptor(DESCRIPTOR)
+
+Payload = _reflection.GeneratedProtocolMessageType('Payload', (_message.Message,), {
+
+  'OtpParameters' : _reflection.GeneratedProtocolMessageType('OtpParameters', (_message.Message,), {
+    'DESCRIPTOR' : _PAYLOAD_OTPPARAMETERS,
+    '__module__' : 'otpauth_migration_pb2'
+    # @@protoc_insertion_point(class_scope:otpauth_migration.Payload.OtpParameters)
+    })
+  ,
+  'DESCRIPTOR' : _PAYLOAD,
+  '__module__' : 'otpauth_migration_pb2'
+  # @@protoc_insertion_point(class_scope:otpauth_migration.Payload)
+  })
+_sym_db.RegisterMessage(Payload)
+_sym_db.RegisterMessage(Payload.OtpParameters)
+
+
+# @@protoc_insertion_point(module_scope)
diff --git a/otpauth_migration_decoder/src/otpauth_migration_pb2.pyi b/otpauth_migration_decoder/src/otpauth_migration_pb2.pyi
new file mode 100644
index 0000000..07016a8
--- /dev/null
+++ b/otpauth_migration_decoder/src/otpauth_migration_pb2.pyi
@@ -0,0 +1,111 @@
+"""
+@generated by mypy-protobuf.  Do not edit manually!
+isort:skip_file
+"""
+import builtins
+import google.protobuf.descriptor
+import google.protobuf.internal.containers
+import google.protobuf.internal.enum_type_wrapper
+import google.protobuf.message
+import typing
+import typing_extensions
+
+DESCRIPTOR: google.protobuf.descriptor.FileDescriptor = ...
+
+class Payload(google.protobuf.message.Message):
+    DESCRIPTOR: google.protobuf.descriptor.Descriptor = ...
+    class Algorithm(metaclass=_Algorithm):
+        V = typing.NewType('V', builtins.int)
+
+    ALGORITHM_UNSPECIFIED = Payload.Algorithm.V(0)
+    ALGORITHM_SHA1 = Payload.Algorithm.V(1)
+    ALGORITHM_SHA256 = Payload.Algorithm.V(2)
+    ALGORITHM_SHA512 = Payload.Algorithm.V(3)
+    ALGORITHM_MD5 = Payload.Algorithm.V(4)
+
+    class _Algorithm(google.protobuf.internal.enum_type_wrapper._EnumTypeWrapper[Algorithm.V], builtins.type):
+        DESCRIPTOR: google.protobuf.descriptor.EnumDescriptor = ...
+        ALGORITHM_UNSPECIFIED = Payload.Algorithm.V(0)
+        ALGORITHM_SHA1 = Payload.Algorithm.V(1)
+        ALGORITHM_SHA256 = Payload.Algorithm.V(2)
+        ALGORITHM_SHA512 = Payload.Algorithm.V(3)
+        ALGORITHM_MD5 = Payload.Algorithm.V(4)
+
+    class DigitCount(metaclass=_DigitCount):
+        V = typing.NewType('V', builtins.int)
+
+    DIGIT_COUNT_UNSPECIFIED = Payload.DigitCount.V(0)
+    DIGIT_COUNT_SIX = Payload.DigitCount.V(1)
+    DIGIT_COUNT_EIGHT = Payload.DigitCount.V(2)
+
+    class _DigitCount(google.protobuf.internal.enum_type_wrapper._EnumTypeWrapper[DigitCount.V], builtins.type):
+        DESCRIPTOR: google.protobuf.descriptor.EnumDescriptor = ...
+        DIGIT_COUNT_UNSPECIFIED = Payload.DigitCount.V(0)
+        DIGIT_COUNT_SIX = Payload.DigitCount.V(1)
+        DIGIT_COUNT_EIGHT = Payload.DigitCount.V(2)
+
+    class OtpType(metaclass=_OtpType):
+        V = typing.NewType('V', builtins.int)
+
+    OTP_TYPE_UNSPECIFIED = Payload.OtpType.V(0)
+    OTP_TYPE_HOTP = Payload.OtpType.V(1)
+    OTP_TYPE_TOTP = Payload.OtpType.V(2)
+
+    class _OtpType(google.protobuf.internal.enum_type_wrapper._EnumTypeWrapper[OtpType.V], builtins.type):
+        DESCRIPTOR: google.protobuf.descriptor.EnumDescriptor = ...
+        OTP_TYPE_UNSPECIFIED = Payload.OtpType.V(0)
+        OTP_TYPE_HOTP = Payload.OtpType.V(1)
+        OTP_TYPE_TOTP = Payload.OtpType.V(2)
+
+    class OtpParameters(google.protobuf.message.Message):
+        DESCRIPTOR: google.protobuf.descriptor.Descriptor = ...
+        SECRET_FIELD_NUMBER: builtins.int
+        NAME_FIELD_NUMBER: builtins.int
+        ISSUER_FIELD_NUMBER: builtins.int
+        ALGORITHM_FIELD_NUMBER: builtins.int
+        DIGITS_FIELD_NUMBER: builtins.int
+        TYPE_FIELD_NUMBER: builtins.int
+        COUNTER_FIELD_NUMBER: builtins.int
+        secret: builtins.bytes = ...
+        name: typing.Text = ...
+        issuer: typing.Text = ...
+        algorithm: global___Payload.Algorithm.V = ...
+        digits: global___Payload.DigitCount.V = ...
+        type: global___Payload.OtpType.V = ...
+        counter: builtins.int = ...
+
+        def __init__(self,
+            *,
+            secret : builtins.bytes = ...,
+            name : typing.Text = ...,
+            issuer : typing.Text = ...,
+            algorithm : global___Payload.Algorithm.V = ...,
+            digits : global___Payload.DigitCount.V = ...,
+            type : global___Payload.OtpType.V = ...,
+            counter : builtins.int = ...,
+            ) -> None: ...
+        def ClearField(self, field_name: typing_extensions.Literal[u"algorithm",b"algorithm",u"counter",b"counter",u"digits",b"digits",u"issuer",b"issuer",u"name",b"name",u"secret",b"secret",u"type",b"type"]) -> None: ...
+
+    OTP_PARAMETERS_FIELD_NUMBER: builtins.int
+    VERSION_FIELD_NUMBER: builtins.int
+    BATCH_SIZE_FIELD_NUMBER: builtins.int
+    BATCH_INDEX_FIELD_NUMBER: builtins.int
+    BATCH_ID_FIELD_NUMBER: builtins.int
+    version: builtins.int = ...
+    batch_size: builtins.int = ...
+    batch_index: builtins.int = ...
+    batch_id: builtins.int = ...
+
+    @property
+    def otp_parameters(self) -> google.protobuf.internal.containers.RepeatedCompositeFieldContainer[global___Payload.OtpParameters]: ...
+
+    def __init__(self,
+        *,
+        otp_parameters : typing.Optional[typing.Iterable[global___Payload.OtpParameters]] = ...,
+        version : builtins.int = ...,
+        batch_size : builtins.int = ...,
+        batch_index : builtins.int = ...,
+        batch_id : builtins.int = ...,
+        ) -> None: ...
+    def ClearField(self, field_name: typing_extensions.Literal[u"batch_id",b"batch_id",u"batch_index",b"batch_index",u"batch_size",b"batch_size",u"otp_parameters",b"otp_parameters",u"version",b"version"]) -> None: ...
+global___Payload = Payload
diff --git a/otpauth_migration_decoder/tests/__init__.py b/otpauth_migration_decoder/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/otpauth_migration_decoder/tests/test_decode_secret.py b/otpauth_migration_decoder/tests/test_decode_secret.py
new file mode 100644
index 0000000..1b8e903
--- /dev/null
+++ b/otpauth_migration_decoder/tests/test_decode_secret.py
@@ -0,0 +1,19 @@
+import pytest
+
+from src.decoder import decode_secret
+
+
+@pytest.mark.parametrize(
+    'secret,expected_result',
+    [
+        (b'Hello!\xde\xad\xbe\xef', 'JBSWY3DPEHPK3PXP', ),
+        (b'Hello!', 'JBSWY3DPEE',),
+        (b'\xde\xad\xbe\xef', '32W353Y',),
+    ],
+)
+def test_decode_secret(secret, expected_result):
+    # act
+    result = decode_secret(secret)
+
+    # assert
+    assert result == expected_result
diff --git a/otpauth_migration_decoder/tests/test_decoded_data.py b/otpauth_migration_decoder/tests/test_decoded_data.py
new file mode 100644
index 0000000..c62563c
--- /dev/null
+++ b/otpauth_migration_decoder/tests/test_decoded_data.py
@@ -0,0 +1,31 @@
+from src.decoder import decoded_data
+
+
+def test_decoded_data__expected():
+    # arrange
+    data = ['CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC', ]
+
+    # act
+    generator = decoded_data(data)
+    result = list(generator)
+
+    # assert
+    assert result == [b'\n1\n\nHello!\xde\xad\xbe\xef\x12\x18Example:alice@google.com\x1a\x07Example0\x02', ]
+
+
+def test_decoded_data__list__expected():
+    # arrange
+    data = [
+        'CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+        'CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+    ]
+
+    # act
+    generator = decoded_data(data)
+    result = list(generator)
+
+    # assert
+    assert result == [
+        b'\n1\n\nHello!\xde\xad\xbe\xef\x12\x18Example:alice@google.com\x1a\x07Example0\x02',
+        b'\n1\n\nHello!\xde\xad\xbe\xef\x12\x18Example:alice@google.com\x1a\x07Example0\x02',
+    ]
diff --git a/otpauth_migration_decoder/tests/test_get_otpauth_url.py b/otpauth_migration_decoder/tests/test_get_otpauth_url.py
new file mode 100644
index 0000000..544196b
--- /dev/null
+++ b/otpauth_migration_decoder/tests/test_get_otpauth_url.py
@@ -0,0 +1,18 @@
+from src.decoder import get_otpauth_url
+from src.otpauth_migration_pb2 import Payload
+
+
+def test_get_otpauth_url():
+    # arrange
+    otp = Payload.OtpParameters(
+        secret=b'Hello!\336\255\276\357',
+        name='Example:alice@google.com',
+        issuer='Example',
+        type=2
+    )
+
+    # act
+    result = get_otpauth_url(otp)
+
+    # assert
+    assert result == 'otpauth://totp/Example%3Aalice%40google.com?issuer=Example&secret=JBSWY3DPEHPK3PXP'
diff --git a/otpauth_migration_decoder/tests/test_get_url_params.py b/otpauth_migration_decoder/tests/test_get_url_params.py
new file mode 100644
index 0000000..524b077
--- /dev/null
+++ b/otpauth_migration_decoder/tests/test_get_url_params.py
@@ -0,0 +1,18 @@
+from src.decoder import get_url_params
+from src.otpauth_migration_pb2 import Payload
+
+
+def test_get_url_params():
+    # arrange
+    otp = Payload.OtpParameters(
+        secret=b'Hello!\336\255\276\357',
+        name='Example:alice@google.com',
+        issuer='Example',
+        type=2
+    )
+
+    # act
+    result = get_url_params(otp)
+
+    # assert
+    assert result == 'issuer=Example&secret=JBSWY3DPEHPK3PXP'
diff --git a/otpauth_migration_decoder/tests/test_validate_migration.py b/otpauth_migration_decoder/tests/test_validate_migration.py
new file mode 100644
index 0000000..6259425
--- /dev/null
+++ b/otpauth_migration_decoder/tests/test_validate_migration.py
@@ -0,0 +1,31 @@
+import pytest
+from click import BadParameter
+
+from src.decoder import validate_migration
+
+
+def test_validate_migration__migration__ok():
+    # arrange
+    migration = 'otpauth-migration://offline?data=CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC'
+
+    # act
+    result = validate_migration(None, None, migration)
+
+    # assert
+    assert result == ['CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC']
+
+
+@pytest.mark.parametrize(
+    'broken_migration',
+    [
+        'otpauth-migration://online?data=CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+        'CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+        'offline?data=CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+        'otpauth-migration://online?data=Cu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+        'data=CjEKCkhlbGxvId6tvu8SGEV4YW1wbGU6YWxpY2VAZ29vZ2xlLmNvbRoHRXhhbXBsZTAC',
+    ]
+)
+def test_validate_migration__broken_migration__raise(broken_migration):
+    # act & assert
+    with pytest.raises(BadParameter):
+        validate_migration(None, None, broken_migration)
diff --git a/otpauth_migration_decoder/tox.ini b/otpauth_migration_decoder/tox.ini
new file mode 100644
index 0000000..19e9d8e
--- /dev/null
+++ b/otpauth_migration_decoder/tox.ini
@@ -0,0 +1,12 @@
+[tox]
+envlist = py39
+
+[testenv]
+setenv =
+    COVERAGE_FILE = {envlogdir}/.coverage
+    PYTHONPATH = src
+commands =
+    coverage run --source=src --module pytest --verbose tests
+    coverage report --show-missing
+    isort .
+    mypy src --pretty
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..f9fcc45
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+pillow
+pyzbar
+qrcode
\ No newline at end of file